Piston water-meter



(No Model.) 2 Sheets-Sheet 1 W. RQPARK.

PISTON WATER METER. 7 N0. 29?);506. Patented Feb. 12, 1884.

(No Model.)

2 sheets S'heet 2,

W". PARK. PISTON WATER METER.

Patented Feb. 12, 1884.

UN TEDSTATES PATENT. QFFICEQ W LLIAM n. PARK, or rnunron, ASSIGNOR TO THE EQUITABLE WATER METER COMPANY, or BOSTON, MASSACHUSETTS.

To aZZ whom it may concern.-

PISTON WATER-METER.

- SPECIFICATION forming part of Letters Patent, No. 293,506, dated February 12 1884,

Application filed December 5, 1883. (No model.)

Beit known that LWM. It. PARK, of Taunton, in the county of Bristol, and in the State of in which with a rounded face, as shown at O.

Figure 1 shows a longitudinal central sectional view of one end of a piston water-meter with my improved cushion in place therein; Fig. 2, a perspective viewof the end of the piston shown in Fig. 1; Fig. 3, a similar view of .theinner face of the cylinder-hcad Figs. 4 and 5, detail sectionalviews of the form of cushion heretofore used; and Figs. 6 and 7, similar views showing the shape and action of my improved cushion.

The object of my invention is to provide an improved means of preventing the shock and noise of the pounding of the pistons of watermeters; and to this end it consists in the construction, arrangement, and combination of parts, as hereinafter set forth, and more specifically pointed out in the claims.

In the drawings, A designates the casing of a piston water-meter, of which only one end is shown in the drawings. One of the pistons, B, is shown within the casing or cylinder as near the end of its outward stroke. On the outer face of this piston is an annular boss, 0, Upon the inner face of the cylinder-head is a corresponding annular boss or flange, D, carrying upon its inner end or face in a dovetailed annular groove, E, a ring of rubber, F. This ring corresponds in diameter with the annular boss referred to above, and its center is in line with the center of the latter. The face of the ring, against which the boss strikes, is flat with rounded corners, as shown at F. The flangeD is high enough to prevent the nut G, which I servesto fasten the piston upon its rod H, from inder-head. These are to allow the free passage of water into and from the cavity I within the flange, so that the pressure of the water can be freely brought to bear upon the portion of the face of the piston which is inclosed within the boss 0, as Well as upon that part of the piston-surface without said boss, and so that when the boss comes in contact with and com presses the annular cushion F the water can escape from the cavity. The cushion then will take up all the shock. If the water could not escape from the cavity within the flange and in front of the piston, there would be a jar and shock at each blow of the piston, because of the non-elasticity and incompressibility of the confined water.

Rubber cushions have before been used to The upper portion is spread over the edges of thegroove, and is cut by them at the place marked a in the figure. The outer edges of the cushion so formed have been found to become jagged or raggedly cut in a short time, and the cushion itself to be rendered thereby inoperative to prevent pounding of the piston.

My cushion F is formed with a rounded contact or impact surface, as shown in Fig. 6, so that when the rounded boss 0 on the piston comes in contact with and compresses it the upper portion of the cushion does not overlap the edges of the dovetailed holdinggroove, but assumes the form shown in Fig. 7, without any sharp corners or edges to become ragged or split. As shown, when my cushion is under compression the sides are not bent over the groove-edges at an angle, but the line of the side-of the upper portion forms, substantially, a continuation of the line of the side of base of the cushion. Said cushion is then not cut by the groove-edges at a, Fig. 7.

I only show one of the pistons and one end of the cylinder, but I, of course, contemplate using the same form-of cushion at the other end of the cylinder or casing to take the blow of the other piston.

Instead of an annular cushion formed with a rounded impact surface, a single piece of rubber, formed like a frustum of a cone, with a rounded upper end, could be used, its lower end or base being inserted and held in a suitably-shaped cavity. If desired, a series of these could be used, so situated as to receive the impact of a series of bosses on the face of the piston.

Having thus described my invention, what I claim is V 1. In combination with the piston provided with a boss having a rounded face, the cushion at or near the end of the cylinder, also formed with a rounded face opposing that of the boss, and adapted to be struck by the latter as the piston nears the end of its stroke, substantially as shownand described.

2. In combination with the piston provided on its face with an annular boss, the annular cushion with rounded face held in a groove in the flange attached to the inner face of cylinder-head, substantially as and for the purpose set forth.

3. The annular flange 011 the inner face of the cylinder-head, provided with the annular dovetailed groove, the annular cushion held in the groove, and having its portion projecting above the face of the flange made rounded in crosssection, and the piston provided With an annular boss adapted to strike the cushion as the piston nears the end of its stroke, all combined substantially as and for the purpose described.

4. The annular flange 011 the inner face of the cylinder-head, provided with openings through its sides and on its face with an annular dovetailed groove, the annular rubber cushion fitting in said groove, and having its portion above the flange-face made rounded in cross-section, and the annular boss upon the cylinder, adapted to come in contact with the cushion as the piston approaches the end of its stroke, all combined and arranged substantially as and for the purpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 13th day of November, 1883.

IVM. R. PARK.

Vi messes:

ELMER P. Hown, B. H. WARREN. 

